Thema: I've been wanting to learn how to make animations for a long time

Good day! I've been wanting to learn how to make animations for a long time — I kept putting it off, but now I want to get serious about it. I'm interested not only in animation itself, but also in the preparation process: concept art, 3D models, rigging. I'm thinking about where to start in order to gain a comprehensive understanding of the profession. Are there any online courses or schools where I can learn everything step by step? Please share your experience!